The actuator is the operator mechanism used to open / close a valve. It is mounted on the valve and connected to the valve body. Power-driven actuators (Pneumatic, electric, hydraulic) enable fast operation of large valves. Such actuators are actuated by electrical energy. The actuators allow the valve to be opened and closed, as well as intermediate positions. The limit switch boxes, i-p converters and positioners mounted on these actuators indicate the open / close position of the valve or transmit the information to the automation system.